1
dc2085afb
DEMO MANUAL DC2085
DESCRIPTION
LTC2000, LTC2000A
16-, 14-, 11-Bit, 2.5Gsps to 2.7Gsps DACs
Demonstration circuit 2085 supports the LT C
®
2000 and
LTC2000A, a high speed, high dynamic range family of
DACs. It was specially designed for applications that re-
quire differential DC coupled outputs. DC2085 supports
the complete family of the LTC2000 including 16, 14 and
11 bit parts. For all the variations see Table 1. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
The circuitry on the analog outputs is optimized for analog
frequencies from DC-1.08GHz.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2085
Specifications are at TA = 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage – DC2085 This supply must provide up to 800mA 4.8 5.0 5.2 V
Sampling Frequency (Sample Clock Frequency) 300 2500 or 2700 MHz
Sample Clock Level (Single-Ended) Use a 50Ω Source 0 15 dBm
LVDS Inputs Differential Input Voltage Range
Common Mode Voltage Range
±0.2
0.4
±0.6
1.8
V
V
Table 1. DC2085 Variants
DC2085 VARIANTS PART NUMBER RESOLUTION MAXIMUM SAMPLE RATE OUTPUT FREQUENCY
DC2085A-A LTC2000-16 16-Bit 2.5Gsps DC-1000MHz
DC2085A-B LTC2000-14 14-Bit 2.5Gsps DC-1000MHz
DC2085A-C LTC2000-11 11-Bit 2.5Gsps DC-1000MHz
DC2085A-D LTC2000A-16 16-Bit 2.7Gsps DC-1080MHz
DC2085A-E LTC2000A-14 14-Bit 2.7Gsps DC-1080MHz
DC2085A-F LTC2000A-11 11-Bit 2.7Gsps DC-1080MHz
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DEMO MANUAL DC2085
QUICK START PROCEDURE
DC2085 is easy to set up to evaluate the performance of the
LTC2000. Refer to Figure 1 for proper measurement equip-
ment set-up and follow the procedure below:
Setup
If the Altera Stratix IV GX FPGA Development Kit was not
supplied with the DC2085 demonstration circuit, follow
the Altera Stratix IV demo manual to install the required
software and for connecting the Altera Stratix IV to the
DC2085 and to a PC.
Figure 1. DC2085 Setup (zoom for details)
SINGLE-ENDED
SAMPLE CLOCK INPUT
CONNECT USB TO PC
RUNNING LTDACGen SOFTWARE
JUMPERS SHOWN IN THEIR DEFAULT POSITIONS
THE DC2085 CONNECTS TO THE ALTERA STRATIX IV
EVALUATION BOARD VIA HSMC CONNECTORS
5V
DIFFERENTIAL OUTPUTS
NOMINAL OUTPUTS LOOK LIKE 50Ω
PER SIDE TO DRIVE AN EXTERNAL
BALUN, OR COMBINER
+
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dc2085afb
DEMO MANUAL DC2085
QUICK START PROCEDURE
HARDWARE SETUP
SMAs
J2 & J3: Differential Trigger Input. Apply a signal to J2
from a 50Ω driver. Absorptive filters are required for
data sheet performance. Use J2 and J3 if the trigger is a
differential signal.
J4: Sample Clock Input. Apply a clock signal to this
SMA connector from a 50Ω driver. A 0dBm clock source
should be sufficient, but for best phase noise and jitter
performance, use the highest possible amplitude and slew
rate, up to 15dBm.
J5 & J6: Differential Output Signals. These SMAs provide
access to the differential outputs of the DAC. The output
impedance is designed to be 50Ω at each SMA, or 100Ω
differential. Connect an external balun or combiner to
these pins to drive a single-ended spectrum analyzer.
Linear Technology has various coupon boards for specific
frequencies and applications. More information is available
at www.linear.com.
J8: SYNC. This SMA is to provide access to the sync pin
of the LT8614. It is not used in normal use.
Turrets
+5V: Positive Input Voltage for the DAC and Digital Circuits.
This voltage feeds a series of regulators that supply the proper
voltages for the DAC. The voltage range for this turret is 4.8V
to 5.2V. Note: For close-in phase noise plots, driving this
voltage is not ideal. There is a known 20kHz noise hump in
the spectrum that is generated by the regulators. For the best
phase noise performance, back drive the onboard regulators
with the provided turrets from a low noise supply.
GND: Ground Connection. This demo board has only a
single ground plane. This turret should be tied to the GND
terminal of the power supply being used.
SVDD3V0: Optional 3.0V Input. This pin is connected
directly to the SVDD pin of the DAC. It requires a supply
that can deliver up to 100mA. Driving this pin will shut
down the onboard regulator.
AVDD3V3: Optional 3.3V Input. This pin is connected
directly to the AVDD3V3 pin of the DAC. It requires a
supply that can deliver up to 200mA. Driving this pin will
shut down the onboard regulator.
DVDD3V3: Optional 3.3V Input. This pin is connected
directly to the DVDD3V3 pin of the DAC. It requires a
supply that can deliver up to 50mA. Driving this pin will
shut down the onboard regulator.
AVDD1V8: Optional 1.8V Input. This pin is connected
directly to the AVDD1V8 pin of the DAC. It requires a
supply that can deliver up to 1A. Driving this pin will shut
down the onboard regulator.
DVDD3V3: Optional 1.8V Input. This pin is connected
directly to the DVDD1V8 pin of the DAC. It requires a
supply that can deliver up to 500mA. Driving this pin will
shut down the onboard regulator.
VP1: This is a test point that is at the output of the on-
board switching regulator. It is meant for test purposes.
It can also be driven to 2.5V to shut down the output of
the switching regulator.
TSTP & TSTN: These pins are tied directly to the TSTP
and TSTN pins of the DAC. They can be used to measure
the internal temperature and timing of the LVDS inputs.
FSADJ: This is an optional pin that is tied directly to the
FSADJ pin of the DAC. It can be used to set the full-scale
output current of the DAC. In normal operation this pin
is tied to GND through 500Ω to set a current of 40mA at
the output.
REFIO: This pin is tied directly to the REFIO pin of the
DAC and is used to set the reference voltage for the DAC.
Normally it is internally set to 1.25V but can be overdriven
with an external voltage from 1.1V to 1.4V.
Jumpers
The DC2085 demonstration circuit should have the fol-
lowing jumper settings as default positions.
JP1: PD. In the RUN position this pin results in normal
operation of the DAC. In the SHDN position the DAC is
powered down. (Default: RUN or up)
JP2: SPI and JTAG. This jumper selects how the FPGA is
programmed. In the SPI position the FPGA is programmed
from the onboard FTDI chip and the LTDACGen software. In
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dc2085afb
DEMO MANUAL DC2085
the JTAG position the J9 is used with a JTAG programmer
to program the FPGA. (Default: SPI or down)
Connectors
J1: DC590. This is an optional header that can be used
to program the DAC with the DC590. (Default: removed)
J9: JTAG. This is an optional header that can be used to
program the FPGA through a JTAG programmer. (Default:
removed)
J7: USB. Connect a USB cable from J7 to a computer with
the LTDACGen software installed.
J10 & J11: HSMC Connectors. These connectors are
designed to connect to the Altera Stratix IV development
board. All of the communication between the FPGA and
the DAC is routed through these connectors.
APPLYING POWER AND SIGNALS TO THE DC2085
DEMONSTRATION CIRCUIT
If a Stratix IV demo board is used to supply data to the
DC2085, the two boards should first be bolted together
and a proper connection should be made. If Linear Tech-
nology provided the Stratix IV board the proper bit file is
already installed in flash memory and will begin to operate
when the board is powered on. If an unprogrammed FPGA
board is used, refer to the appropriate documentation on
how to program it.
Power should be applied to the system in this order:
1. Connect the Altera board to the provided power supply.
2. Connect the USB cable to J7.
3. Apply a clock to J4.
4. Connect any optional output board to J5 and J6.
5. Turn on the voltage to the Altera board.
6. Connect the 5V from a bench supply to the +5V turret
on the DC2085.
7. Open the LTDACGen software and hit connect.
LTDACGen should report back that it is connected to the
FPGA. See Figure 2:
QUICK START PROCEDURE
Figure 2. LTDACGen Connected to FPGA
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dc2085afb
DEMO MANUAL DC2085
QUICK START PROCEDURE
ANALOG OUTPUT NETWORK
The analog output network of the DC2085 has been
designed to maximize the performance of the LTC2000.
The LTC2000 drives two 50Ω resistors on each side to
minimize the impedance it sees. This maximizes the SFDR
the DAC is able to produce. If a larger signal swing is
required this impedance can be increased, but the SFDR
might degrade. The output also has a pi network of 50Ω
resistors to pad the output impedance of the board up to
50Ω per side. This allows the demo board to drive a 50Ω
analyzer through a balun or other combiner.
Linear Technology has various coupon boards for specific
frequencies and applications. More information is available
at www.linear.com.
SAMPLE CLOCK
The sample clock to the DC2085 demonstration circuit
board is marked J4. As a default it is a single-ended 50Ω
input port. There is an onboard balun that does a single-
ended to differential translation.
For the best noise performance, the sample input must
be driven with a very low jitter signal generator source.
The amplitude should be as large as possible up to ±1.8V
or 9dBm.
SOFTWARE
The software for the DC2085, LTDACGen is available at
www.linear.com free of charge. It simplifies the creation
of complex waveforms and loading them into the FPGA to
test the DC2085. For more information about how to use
the LTDACGen software, refer to the help files that come
with the software.
RESULTS
After everything is set up and the software is con-
nected to the DAC demo system, a sine wave can be
added to the output waveform. The default frequency is
399.932861328MHz (Figure 3). By clicking Update FPGA,
the data is sent to the FPGA and is then used to program
the DAC. A spectrum analyzer can then be used to view
the results (Figure 4).
Figure 3. Default Frequency
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DEMO MANUAL DC2085
Figure 4. DC2085 Results. Close-In (Top) and Wideband (Bottom)
QUICK START PROCEDURE
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DEMO MANUAL DC2085
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 13 C1, C25, C26, C29, C31,
C32, C33, C34, C35, C36,
C37, C71, C72
CAP., X7R, 0.1µF, 16V 10% 0402 AVX, 0402YC104KAT2A
2 4 C2, C3, C8, C19 CAP., NPO, 0.01µF, 25V 5% 0603 TDK, C1608C0G1H103J
3 9 C4, C6, C9, C11, C14,
C18, C67, C68, C69 CAP., X7R, 1µF, 16V 10% 0603 AVX, 0603YC105KAT2A
4 5 C5, C7, C10, C12, C15 CAP., TANT., 47µF, 16V 10% 7343 AVX, TAJD476K016RNJ
5 4 C13, C16, C27, C28 CAP., X5R, 4.7µF, 16V 20% 1206 TDK, C3216X5R1C475M
6 2 C17, C40 CAP., X5R, 10µF, 10V 20% 0603 AVX, 0603ZD106MA2T
7 1 C20 CAP., C0G, 4.7pF, 50V ± 0.25pF 0603 AVX, 06035A4R7CAT2A
8 2 C21, C24 CAP., X7R, 0.1µF, 16V 10% 0603 TDK, C1608X7R1C104K
9 1 C22 CAP., X7R, 1µF, 25V 10% 0603 TDK, C1608X7R1E105K
10 2 C23, C70 CAP., X7R, 47µF, 10V 10% 1210 MURATA, GRM32ER71A476KE15L
11 1 C30 CAP., X5R, 3.3µF, 16V 10% 0603 TDK, C1608X5R1C335K
12 2 C38, C39 CAP., COG, 27pF, 50V 5% 0402 TDK, C1005C0G1H270J
13 2 C41, C42 CAP., COG, 100pF, 25V 5% 0201 TDK, C0603C0G1E101J
14 1 C43 CAP., X5R, 0.01µF, 16V 10% 0402 MURATA, GRM155R61C103KA01D
15 1 C44 CAP., X7R, 47nF, 25V 10% 0402 MURATA, GRM155R71E473KA88D
16 9 C45, C48, C49, C53, C54,
C58, C61, C62, C64 CAP., X5R, 100µF, 6.3V 20% 1206 TDK, C3216X5R0J107M
17 10 C46, C50, C51, C52, C55,
C56, C57, C59, C60, C63 CAP., X7S, 2.2µF, 4V 20% 0306 MURATA, LLL185C70G225ME01L
18 1 C47 CAP., COG, 10pF, 25V 5% 0201 MURATA, GRM0335C1E100JA01D
19 0 C65 CAP., OPT, 0402 OPTION
20 1 C66 CAP., NP0, 1pF, 25V ±.25pF 0402 AVX, 04023A1R0CAT2A
21 2 C73, C74 CAP., X7R, 4.7µF, 50V 10% 1206 MURATA, GRM31CR71H475KA12L
22 1 C75 CAP., X7R, 10µF, 50V 10% 1210 MURATA, GRM32ER71H106KA12L
23 2 C76, C77 CAP., X5R, 1µF, 50V 10% 0603 MURATA, GRM188R61H105KAALD
24 1 D1 DIODE, TVS, 70V,SMA DIODES INC./ ZETEX, SMAT70A-13-F
25 1 D2 DIODE, TVS, 24V,SMA DIODES INC./ ZETEX, SMAJ24A-13-F
26 1 D3 LED, RED, WATERCLEAR, 0805 WÜRTH, 150080RS75000
27 10 E1, E2, E3, E5–E11 TEST POINT, TURRET, .061, PBF MILL-MAX, 2308-2-00-80-00-00-07-0
28 2 E4, E12 TEST POINT, TURRET, .094, PBF MILL-MAX, 2501-2-00-80-00-00-07-0
29 2 JP1, JP2 HEADER, 3 PIN, .079 SULLINS, NRPN031PAEN-RC
30 1 J1 HEADER, 2×7 DUAL ROW MOLEX 87831-1420
31 3 J2, J3, J8 CON., SMA JACK, STRAIGHT, THRU-HOLE AMPHENOL CONNEX, 132134
32 1 J4 CON., SMA PCB TOP MOUNT AEP, 9650-1113-005
33 2 J5, J6 CON., SMA 50Ω EDGE-LAUNCH EMERSON, 142-0701-851
34 1 J7 CONNECTOR, USB TYPE B, RIGHT ANGLE PCB
MOUNT FCI, 61729-0010BLF
35 1 J9 HEADER, 2X5, 0.100 SAMTEC, TSW-105-07-L-D
36 2 J10, J11 CONNECTOR, HSMC SAMTEC, ASP-122952-01
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DEMO MANUAL DC2085
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
37 6 L1, L2, L3, L4, L6, L7 FERRITE BEAD, 33Ω AT 100mHz, 1206 MURATA, BLM31PG330SN1L
38 1 L5 INDUCTOR, 2.2µH, 20% HIGH CURRENT, SMT VISHAY, IHLP2020BZER2R2M11
39 1 L8 INDUCTOR, CERAMIC CHIP, 1nH, 5%, 0402 COILCRAFT, 0402CS-1N0XJLU
40 1 L9 FERRITE BEAD, 30Ω AT 100mHz, 0805 TDK, MPZ2012S300A
41 1 L10 INDUCTOR, 6.8µH, 20% HIGH CURRENT, SMT VISHAY, IHLP2020BZER6R8M11
42 2 MTG5, MTG6 STANDOFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON)
43 2 Q1, Q2 TRANSISTOR, N-CH. POWER MOSFET, SOIC 8L FAIRCHILD, FDS8870
44 6 R1, R2, R3, R13, R17,
R30 RES., CHIP, 1k, 1/16W, 5% 0402 VISHAY, CRCW04021K00JNED
45 1 R4 RES., CHIP, 4.7k, 1/16W, 5% 0402 YAGEO, RC0402JR-074K7L
46 4 R5, R14–R16 RES., CHIP, 10k, 1/16W, 5% 0402 YAGEO, RC0402JR-0710KL
47 2 R6, R8 RES., CHIP, 2k, 1/16W, 5% 0402 VISHAY, CRCW04022K00JNED
48 0 R7, R10, R23, R24, R25,
R27, R28, R36, R37,
R38, R39, R43, R62, R63
RES., CHIP, OPT, 0402 OPTION
49 1 R9 RES., CHIP, 39Ω, 1/16W, 1% 0402 VISHAY, CRCW040239R0FKED
50 1 R11 RES., CHIP, 0Ω JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED
51 1 R12 RES., CHIP, 12k, 1/16W, 5% 0402 VISHAY, CRCW040212K0JNED
52 1 R18 RES., CHIP, 2.2k, 1/16W, 5% 0402 VISHAY, CRCW04022K20JNED
53 2 R19, R20 RES., CHIP, 3.24k, 1/16W, 1% 0402 VISHAY, CRCW04023K24FKED
54 1 R21 RES., CHIP, 1k, 1/16W, 1% 0402 YAGEO, RC0402FR-071KL
55 1 R22 RES., CHIP, 7.15k, 1/16W, 1% 0402 VISHAY, CRCW04027K15FKED
56 2 R26, R29 RES., CHIP, 49.9Ω, 1/6W, 1% 0201 VISHAY, CRCW020149R9FNED
57 7 R31-R35, R41, R42 RES., CHIP, 10Ω, 1/16W, 1% 0402 VISHAY, CRCW040210R0FKED
58 10 R40, R44, R46, R47,
R48, R57, R58, R59,
R60, R61
RES., CHIP, 50Ω, HIGH FREQ., 1/20W, 0.1% 0402 VISHAY, FC0402E50R0BST1
59 1 R45 RES., CHIP, 499Ω, 1/16W, 1% 0402 VISHAY, CRCW0402499RFKED
60 1 R49 RES., CHIP, 41.2k, 1/10W, 1% 0603 VISHAY, CRCW060341K2FKEA
61 1 R50 RES., CHIP, 309k, 1/10W, 1% 0603 VISHAY, CRCW0603309KFKEA
62 1 R51 RES., CHIP, 243k, 1/10W, 1% 0603 VISHAY, CRCW0603243KFKEA
63 1 R52 RES., CHIP, 50Ω, 1/8W, 5% 0603 VISHAY, FC0603E50R0JST1
64 1 R53 RES., CHIP, 560Ω, 1/10W, 5% 0603 VISHAY, CRCW0603560RJNEA
65 1 R54 RES., CHIP, 10k, 1/10W, 1% 0603 VISHAY, CRCW060310K0FKEA
66 2 R55, R56 RES., CHIP, 20Ω, 1/16W, 1% 0402 VISHAY, CRCW040220R0FKED
67 1 T1 TRANSFORMER, BALUN ANAREN, B0430J50100AHF
68 1 U2 IC, USB TO MULTIPURPOSE UART/FIFO, TQFP FTDI, FT2232HL
69 1 U3 IC, QUAD MUX/DEMUX, TSSOP-16 FAIRCHILD, FST3257MTCX
70 1 U4 IC, EEPROM 1kBIT 3MHZ, 8TSSOP MICROCHIP, 93LC46C-I/ST
71 1 U5 IC, MICROPOWER REGULATOR, SO-8 LINEAR TECHNOLOGY, LT1763CS8-3#PBF
72 2 U6, U7 IC, MICROPOWER REGULATOR, SO-8 LINEAR TECHNOLOGY, LT1763CS8-3.3#PBF
73 1 U8 IC, BUCK REGULATOR, QFN LINEAR TECHNOLOGY, LT8614IUDC#PBF
74 1 U9 IC, VOLTAGE REFERENCE, MSOP LINEAR TECHNOLOGY, LTC6655CHMS8-2.048#PBF
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dc2085afb
DEMO MANUAL DC2085
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
75 2 U10, U11 I.C., LOW DROPOUT REGULATOR, 3×3mm, DFN LINEAR TECHNOLOGY, LT3080EDD#PBF
76 1 U12 I.C., 80V IDEAL DIODE, DFN-6L LINEAR TECHNOLOGY, LTC4359HDCB-#TRPBF
77 2 XJP1, XJP2 SHUNT, 2mm SAMTEC, 2SN-BK-G
78 1 Y1 CRYSTAL, 12.0 MHz, SMT ABRACON, ABMM2-12.000MHZ-E2-T
DC2085A-A Required Circuit Components
1 1 GENERAL BOM DC2085A
2 1 U1 IC, 16-BIT 2.5Gsps DAC LINEAR TECHNOLOGY, LTC2000IY-16
DC2085A-B Required Circuit Components
1 1 GENERAL BOM DC2085A
2 1 U1 IC, 14-BIT 2.5Gsps DAC LINEAR TECHNOLOGY, LTC2000IY-14
DC2085A-C Required Circuit Components
1 1 GENERAL BOM DC2085A
2 1 U1 IC, 11-BIT 2.5Gsps DAC LINEAR TECHNOLOGY, LTC2000IY-11
DC2085A-D Required Circuit Components
1 1 GENERAL BOM DC2085A
2 1 U1 IC, 16-BIT 2.7Gsps DAC LINEAR TECHNOLOGY, LTC2000AIY-16
DC2085A-E Required Circuit Components
1 1 GENERAL BOM DC2085A
2 1 U1 IC, 14-BIT 2.7Gsps DAC LINEAR TECHNOLOGY, LTC2000AIY-14
DC2085A-F Required Circuit Components
1 1 GENERAL BOM DC2085A
2 1 U1 IC, 11-BIT 2.7Gsps DAC LINEAR TECHNOLOGY, LTC2000AIY-11
10
dc2085afb
DEMO MANUAL DC2085
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Figure 5. DC2085 Demo Circuit Schematic (Sheet 1)
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
01/30/2014
01/30/2014
LTC2000 HIGH SPEED DAC
DEMO CIRCUIT 2085A
U1*
TSTNTSTP
(FROM PAGE 4)
(T0 PAGE 4)
TO PAGE 4
(TO PAGE 4)
LTC2000-X FAMILY
(T0 PAGE 4)
ASSY
LTC2000IY-16
ASSEMBLY TABLE
U1
LTC2000IY-14
LTC2000IY-11
*
-B
-C
-A
NOTES:
1. ALL RESISTORS ARE SIZE 0402, U.O.N.
2. REFER TO PAGE 4 FOR LTC2000 POWER CONNECTIONS.
DIGITAL INPUTS [DA0..DA15] AND [DB0..DB15] FROM PAGE 4
FSADJ REFIO
TRIG N
TRIG P
IOUTPB
IOUTNB
CK
PD
RUN
SHDN
DC590
LTC2000AIY-16
LTC2000AIY-14
LTC2000AIY-11
-E
-F
-D
SVDD3V0
SVDD3V0
SVDD3V0
DCKOP
DCKON
DCKIN
DCKIP
SCK_ALT
CS_ALT
CS_FTDI
SCK_FTDI
SDI_ALT
SDO_ALT
PD_ALT
SDI_FTDI
SDO_FTDI
PD_ALT
DAN15 DAP15
DAP14
DAP13
DAP12
DAP11
DAP10
DAP9
DAP8
DAP7
DAP6
DAP5
DAP4
DAP3
DAP2
DAP1
DAP0
DAN14
DAN13
DAN12
DAN11
DAN10
DAN9
DAN8
DAN7
DAN6
DAN5
DAN4
DAN3
DAN2
DAN1
DAN0
DBN0
DBN1
DBN2
DBN3
DBN4
DBN5
DBN6
DBN7
DBN8
DBN9
DBN10
DBN11
DBN12
DBN13
DBN14
DBN15
DBP0
DBP1
DBP2
DBP3
DBP4
DBP5
DBP6
DBP7
DBP8
DBP9
DBP10
DBP11
DBP12
DBP13
DBP14
DBP15
TRIGGER_N
TRIGGER_P
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
14
N/A
M. HAWKINS
C. MAYOTT
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
14
N/A
M. HAWKINS
C. MAYOTT
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
14
N/A
M. HAWKINS
C. MAYOTT
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
C. MAYOTTPRODUCTION3
-
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
C. MAYOTTPRODUCTION3
-
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
C. MAYOTTPRODUCTION3
-
R4110
R61
50
0402
R33 10
R31 10
C41
100pF
COG
0201
R4210
C42
100pF
COG
0201
R62
OPT
0402
R46
50
0402
R48
50
0402
R59
50
0402
J2
1
R40
50
0402
J1
VUNREG
1
GND
3
MISO
5
MOSI/SDA
7
EESDA
9
EESCL
11
GND
13
VCCIO
2
SCK/SCL
4
CS
6
GND
8
EEVCC
10
EEGND
12
GPIO
14
R23
OPT
0402
J6
1
C40
10uF
R24
OPT
0402
C47
10pF
0201
COG
GND
GND
IN
T1
ANAREN XINGER
1
3
2
4
6
5
R38 OPT
R26
49.9
0201
1%
R32 10
R35 10
E11
R37 OPT
R29
49.9
0201
1%
C65
OPT
0402
L8 1nH
1 2
R63
OPT
0402
R60
50
0402
R28
OPT
0402
R27
OPT
0402
R47
50
0402
R58
50
0402
E9
R34 10
J3
1
R25
OPT
0402
E10
C66
1pF
NP0
DAP15
A8
DAN15
A7
DAP14
B8
DAN14
B7
DAP13
C8
DAN13
C7
DAP12
D8
DAN12
D7
DAP11
E8
DAN11
E7
DAP10
F8
DAN10
F7
DAP9
G8
DAN9
G7
DAP8
H8
DAN8
H7
DAP7
K8
DAN7
K7
DAP6
L8
DAN6
L7
DAP5
M8
DAN5
M7
DAP4
N8
DAN4
N7
DAP3
P8
DAN3
P7
DAP2
Q8
DAN2
Q7
DAP1
R8
DAN1
R7
DAP0
S8
DAN0
S7
DBP15
A10
DBN15
A9
DBP14
B10
DBN14
B9
DBP13
C10
DBN13
C9
DBP12
D10
DBN12
D9
DBP11
E10
DBN11
E9
DBP10
F10
DBN10
F9
DBP9
G10
DBN9
G9
DBP8
H10
DBN8
H9
DBP7
K10
DBN7
K9
DBP6
L10
DBN6
L9
DBP5
M10
DBN5
M9
DBP4
N10
DBN4
N9
DBP3
P10
DBN3
P9
DBP2
Q10
DBN2
Q9
DBP1
R10
DBN1
R9
DBP0
S10
DBN0
S9
DCKIP
J10
DCKIN
J9
CKP
A3
CKN
A2
IOUTP
H1
IOUTN
J1
SCK
S5
SD0
S3
SDI
S4
PD
S1
CS
S2
REFIO
M1
FSADJ
M2
DCKON
J7
DCKOP
J8
TSTP
R4
TSTN
R3
SVDD
S6
J4
1
J5
1
R43
OPT
0402
JP1
1
3
2
R57
50
0402
R39 OPT
E8
C43
0.01uF
0402
X5R
R44
50
0402
R36 OPT
R45 499
11
dc2085afb
DEMO MANUAL DC2085
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
JTAG
SPI
LTC2000 HIGH SPEED DAC
DEMO CIRCUIT 2085A
01/30/2014
SCK_IF
SDI_IF
SDO_IF
CS_IF
JTAG
USB
LTC2000-X FAMILY
VBUS
VBUS
USBD-
USBD+
TCK
TDO
TDI
TMS
TCK
TDO
TMS
TDI
SVDD3V0
SVDD3V0
SVDD3V0
SVDD3V0
SVDD3V0
SVDD3V0
SVDD3V0
SVDD3V0
FTDI_1V8
FTDI_1V8
FTDI_1V8 SVDD3V0
SVDD3V0
SVDD3V0
FIFO_DATA_IN0
FIFO_DATA_IN1 FIFO_DATA_IN2
FIFO_DATA_IN3 FIFO_DATA_IN4
FIFO_DATA_IN5 FIFO_DATA_IN6
FIFO_DATA_IN7
BC0
BC1 BC2
BC3 BC4
BC5 BC6
RXEN
TXEN RDN
WM SIWUA_CTRL
SYSCLK
AC7
SCK_FTDI
SDI_FTDI
SDO_FTDI
CS_FTDI
BD4
BD5
BD6
BD7
OEN_CTRL
BD3 BD2
BD1 BD0
BC7
DATA
PWRENN
RESET#
SUSPEND#
CLK
CS
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
24
N/A
M. HAWKINS
C. MAYOTT
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
24
N/A
M. HAWKINS
C. MAYOTT
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
24
N/A
M. HAWKINS
C. MAYOTT
R12 12KR12 12K
R18
2.2K
R18
2.2K
J7J7
1
2
3
4
5
6
R3
1K
R3
1K
L7
FERRITE BEAD, 33 OHMS
L7
FERRITE BEAD, 33 OHMS
C26
0.1uF
C26
0.1uF
JP2JP2
1
3
2
R16
10K
R16
10K
R5
10K
R5
10K
L6
FERRITE BEAD, 33 OHMS
L6
FERRITE BEAD, 33 OHMS
U2
FT2232HL
U2
FT2232HL
GND
1
GND
5
GND
11
GND
15
GND
25
GND
35
GND
47
GND
51
AGND
10
TEST
13
OSCO
3
OSCI
2
EEDATA
61
EECLK
62
EECS
63
RESET#
14
REF
6
DP
8
DM
7
VREGOUT
49
VREGIN
50
VPHY
4
VPLL
9
VCORE
12
VCORE
37
VCORE
64
VCCIO
20
VCCIO
31
VCCIO
42
VCCIO
56
ADBUS0
16
ADBUS1
17
ADBUS2
18
ADBUS3
19
ADBUS4
21
ADBUS5
22
ADBUS6
23
ADBUS7
24
ACBUS0
26
ACBUS1
27
ACBUS2
28
ACBUS3
29
ACBUS4
30
ACBUS5
32
ACBUS6
33
ACBUS7
34
BDBUS0
38
BDBUS1
39
BDBUS2
40
BDBUS3
41
BDBUS4
43
BDBUS5
44
BDBUS6
45
BDBUS7
46
BCBUS0
48
BCBUS1
52
BCBUS2
53
BCBUS3
54
BCBUS4
55
BCBUS5
57
BCBUS6
58
BCBUS7
59
PWREN#
60
SUSPEND#
36
R9 39R9 39
U3
FST3257MTCX
U3
FST3257MTCX
1B1
2
1B2
3
1A
4
2A
7
2B1
5
2B2
6
3A
9
3B1
11
3B2
10
4B1
14
4B2
13
4A
12
S
1
GND
8
VCC
16
OE
15
R15
10K
R15
10K
R13 1KR13 1K
C28
4.7uF
C28
4.7uF
R1
1K
R1
1K
R6
2K
R6
2K
R8
2K
R8
2K
C29
0.1uF
C29
0.1uF
C1 0.1uFC1 0.1uF
U4
93LC46C-I/ST
U4
93LC46C-I/ST
ORG
6
NC
7
CLK
2
VSS
5
DI
3
CS
1
DO
4
VCC
8
C38
27pF
NPO
C38
27pF
NPO
C30
3.3uF
C30
3.3uF
R17
1K
R17
1K
Y1 12.0 MhzY1 12.0 Mhz
1 3
2
4
C39
27pF
NPO
C39
27pF
NPO
C25
0.1uF
C25
0.1uF
R14
10K
R14
10K
C27
4.7uF
C27
4.7uF
C34
0.1uF
C34
0.1uF
R4
4.7K
R4
4.7K
R2
1K
R2
1K
C31
0.1uF
C31
0.1uF C35
0.1uF
C35
0.1uF
C32
0.1uF
C32
0.1uF C36
0.1uF
C36
0.1uF
R7 OPTR7 OPT
R10
OPT
R10
OPT
C37
0.1uF
C37
0.1uF
J9J9
1
3
5 6
4
2
7
9
8
10
R11
0 OHMS
R11
0 OHMS
C33
0.1uF
C33
0.1uF
Figure 6. DC2085 Demo Circuit Schematic (Sheet 2)
SCHEMATIC DIAGRAM
12
dc2085afb
DEMO MANUAL DC2085
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
01/30/2014
DEMO CIRCUIT 2085A
LTC2000 HIGH SPEED DAC
SVDD3V0
AVDD3V3
DVDD3V3
+5V
AVDD1V8
DVDD1V8
VP1
GND
SYNC
LTC2000-X FAMILY
2.2V
POWER
FAULT
VP1
SVDD3V0
AVDD3V3
DVDD3V3
+5V
+5V
+5V
AVDD1V8
DVDD1V8
SVDD3V0
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
34
N/A
M. HAWKINS
C. MAYOTT
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
34
N/A
M. HAWKINS
C. MAYOTT
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
34
N/A
M. HAWKINS
C. MAYOTT
C44
47nF
0402
25V
C44
47nF
0402
25V
R19
3.24K
R19
3.24K
R54
10K
R54
10K
+
C5
47uF
+
C5
47uF
C3
0.01uF
C3
0.01uF
L3
FERRITE BEAD, 33 OHMS
L3
FERRITE BEAD, 33 OHMS
C71
0.1uF
C71
0.1uF
C77
1.0uF
C77
1.0uF
Q2
FDS8870
Q2
FDS8870
2
1
3
4
5
6
7
8
U6
LT1763CS8-3.3
U6
LT1763CS8-3.3
OUT
1
SEN
2
GND
3
BYP
4
SHDN
5
GND
6
GND
7
IN
8
+
C7
47uF
+
C7
47uF
C8
0.01uF
C8
0.01uF
C68
1.0uF
C68
1.0uF
C24 0.1uFC24 0.1uF
C20
4.7pF
C20
4.7pF
U9
LTC6655CHMS8-2.048
U9
LTC6655CHMS8-2.048
VIN
2
SHDN
1
GND
3
OUTF
7
GND
8
GND
4
OUTS
6
GND
5
R22
7.15K
R22
7.15K
C73
4.7uF
1206
C73
4.7uF
1206
D2
SMAJ24A
D2
SMAJ24A
21
U10
LT3080EDD
U10
LT3080EDD
VIN
7
VCTRL
5
VOUT
3
VIN
8
VOUT
2
VOUT
1
PAD
9
SET
4
C75
10uF
1210
C75
10uF
1210
L2
FERRITE BEAD, 33 OHMS
L2
FERRITE BEAD, 33 OHMS
R30
1K
0402
R30
1K
0402
U7
LT1763CS8-3.3
U7
LT1763CS8-3.3
OUT
1
SEN
2
GND
3
BYP
4
SHDN
5
GND
6
GND
7
IN
8
J8J8
1
D1
SMAT70A
D1
SMAT70A
2 1
+
C10
47uF
+
C10
47uF
U8
LT8614
U8
LT8614
VIN1
4
GND1
6
PG
19
SYNC/MODE
17
TR/SS
16
INTVCC
2
RT
15
GND1
7
FB
20
BIAS
1
SW
22
SW
21
BST
3
GND2
11
VIN2
13
EN/UV
14
GND2
10
GND
18
SW
9
SW
8
R53
560
R53
560
C67
1.0uF
C67
1.0uF
R20
3.24K
R20
3.24K
E6E6
E7E7
E2E2
C72
0.1uF
C72
0.1uF
R55 20R55 20
L5 2.2uHL5 2.2uH
1 2
E5E5
E3E3
+
C15
47uF
+
C15
47uF
E1E1
C70
47uF
1210
C70
47uF
1210
C76
1.0uF
C76
1.0uF
C13
4.7uF
C13
4.7uF
C19
0.01uF
C19
0.01uF
R21
1K
R21
1K
Q1
FDS8870
Q1
FDS8870
2
1
3
4
5
6
7
8
C11
1.0uF
C11
1.0uF
R50
309K
R50
309K
C17
10uF
C17
10uF
L10
6.8uH
L10
6.8uH
1 2
L1
FERRITE BEAD, 33 OHMS
L1
FERRITE BEAD, 33 OHMS
L4
FERRITE BEAD, 33 OHMS
L4
FERRITE BEAD, 33 OHMS
C6
1.0uF
C6
1.0uF
C18
1.0uF
C18
1.0uF
C14
1.0uF
C14
1.0uF
C21
0.1uF
C21
0.1uF
C4
1.0uF
C4
1.0uF
C74
4.7uF
1206
C74
4.7uF
1206
R51
243K
R51
243K
R56 20R56 20
E12E12
LTC4359HDCB
U12
LTC4359HDCB
U12
SHDN
5
IN
4
SOURCE
3
GATE
2
OUT
1
VSS
6
PAD
7
C2
0.01uF
C2
0.01uF
R49 41.2KR49 41.2K
L9
FERRITE BEAD
L9
FERRITE BEAD
D3
RED
D3
RED
21
U11
LT3080EDD
U11
LT3080EDD
VIN
7
VCTRL
5
VOUT
3
VIN
8
VOUT
2
VOUT
1
PAD
9
SET
4
E4E4
C23
47uF
1210
C23
47uF
1210
+
C12
47uF
+
C12
47uF
C9
1.0uF
C9
1.0uF
C22 1.0uFC22 1.0uF
U5
LT1763CS8-3
U5
LT1763CS8-3
OUT
1
SEN
2
GND
3
BYP
4
SHDN
5
GND
6
GND
7
IN
8
R52 50R52 50
C69
1.0uF
C69
1.0uF
C16
4.7uF
C16
4.7uF
Figure 7. DC2085 Demo Circuit Schematic (Sheet 3)
SCHEMATIC DIAGRAM
13
dc2085afb
DEMO MANUAL DC2085
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
HSMC CONNECTORS - MEZZANINE SIDE
01/30/2014
LTC2000 HIGH SPEED DAC
DEMO CIRCUIT 2085A
NET CONNECTIONS FOR LTC2000 POWER PINS TO PCB POWER NETS
LTC2000 POWER CONNECTIONS
U1
LTC2000 POWER BYPASS CAPACITORS
LTC2000-X FAMILY
AVDD33 DVDD18DVDD33 AVDD18
DVDD1V8AVDD3V3DVDD3V3 AVDD1V8
SVDD3V0
AVDD1V8
DVDD1V8
AVDD3V3
DVDD3V3
DCKOP DCKON
DAN15
DBN15 DBP15
DAN14
DBN14 DBP14
DAN13
DBN13 DBP13
DAN12
DBN12 DBP12
DAN11
DBP11
DBN11
DAP10
DAN10
DBP10
DBN10
DAP9
DAN9
DBP9
DBN9
DAP8
DAN8
DBP8
DBN8
SDI_ALT
SCK_ALT
SDO_ALT CS_ALT
BD0 BD1
DAN7 DAP7
DBN7 DBP7
DAN6 DAP6
DBN6 DBP6
DAN5 DAP5
DBN5 DBP5
DAN4 DAP4
DBN4 DBP4
DAP3
DAN3
DBP3
DBN3
DAP2
DAN2
DBP2
DBN2
DAP1
DAN1
DBP1
DBN1
DAP0
DAN0
PD_ALT
BD2 BD3
BD6 BD4
BC0 BD5
BC2 BD7
BC4 BC1
BC5 BC3
BC6 BC7
PWRENN DATA
DCKIP
DCKIN
TRIGGER_P
TRIGGER_N
DBP0
DBN0
DAP11
DAP12
DAP13
DAP14
DAP15
RESET#
FIFO_DATA_IN0 FIFO_DATA_IN2
FIFO_DATA_IN1 FIFO_DATA_IN3
FIFO_DATA_IN5 FIFO_DATA_IN4
FIFO_DATA_IN7 FIFO_DATA_IN6
TXEN
OEN_CTRL
WM
SIWUA_CTRL
RXEN
RDN
SUSPEND#
SYSCLK AC7
CLK CS
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
44
N/A
M. HAWKINS
C. MAYOTT
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
44
N/A
M. HAWKINS
C. MAYOTT
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
3
44
N/A
M. HAWKINS
C. MAYOTT
C64
100uF
C64
100uF
C55
2.2uF
C55
2.2uF
C48
100uF
C48
100uF
C56
2.2uF
C56
2.2uF
C58
100uF
C58
100uF
GND
GNDGNDGND
BANK 2
J10B
ASP-122952-01
GND
GNDGNDGND
BANK 2
J10B
ASP-122952-01
D0
41
D1
42
D2
43
D3
44
3V3
45
12V
46
LVDS_TXP0
47
LVDS_RXP0
48
LVDS_TXN0
49
LVDS_RXN0
50
3V3
51
12V
52
LVDS_TXP1
53
LVDS_RXP1
54
LVDS_TXN1
55
LVDS_RXN1
56
3V3
57
12V
58
LVDS_TXP2
59
LVDS_RXP2
60
LVDS_TXN2
61
LVDS_RXN2
62
3V3
63
12V
64
LVDS_TXP3
65
LVDS_RXP3
66
LVDS_TXN3
67
LVDS_RXN3
68
3V3
69
12V
70
LVDS_TXP4
71
LVDS_RXP4
72
LVDS_TXN4
73
LVDS_RXN4
74
3V3
75
12V
76
LVDS_TXP5
77
LVDS_RXP5
78
LVDS_TXN5
79
LVDS_RXN5
80
3V3
81
12V
82
LVDS_TXP6
83
LVDS_RXP6
84
LVDS_TXN6
85
LVDS_RXN6
86
3V3
87
12V
88
LVDS_TXP7
89
LVDS_RXP7
90
LVDS_TXN7
91
LVDS_RXN7
92
3V3
93
12V
94
CLKOUT1P
95
CLKIN1P
96
CLKOUT1N
97
CLKIN1N
98
3V3
99
GND
165
GND
166
GND
167
GND
168
12V
100
C50
2.2uF
C50
2.2uF
GND
GNDGNDGND
BANK 3
J10C
ASP-122952-01
GND
GNDGNDGND
BANK 3
J10C
ASP-122952-01
LVDS_TXP8
101
GND
169
LVDS_RXP8
102
LVDS_TXN8
103
LVDS_RXN8
104
3V3
105
12V
106
LVDS_TXP9
107
LVDS_RXP9
108
LVDS_TXN9
109
LVDS_RXN9
110
3V3
111
12V
112
LVDS_TXP10
113
LVDS_RXP10
114
LVDS_TXN10
115
LVDS_RXN10
116
3V3
117
12V
118
LVDS_TXP11
119
LVDS_RXP11
120
LVDS_TXN11
121
LVDS_RXN11
122
3V3
123
12V
124
LVDS_TXP12
125
LVDS_RXP12
126
LVDS_TXN12
127
LVDS_RXN12
128
3V3
129
12V
130
LVDS_TXP13
131
LVDS_RXP13
132
LVDS_TXN13
133
LVDS_RXN13
134
3V3
135
12V
136
LVDS_TXP14
137
LVDS_RXP14
138
LVDS_TXN14
139
LVDS_RXN14
140
3V3
141
12V
142
LVDS_TXP15
143
LVDS_RXP15
144
LVDS_TXN15
145
LVDS_RXN15
146
3V3
147
12V
148
LVDS_TXP16
149
LVDS_RXP16
150
LVDS_TXN16
151
LVDS_RXN16
152
3V3
153
12V
154
CLKOUT2P
155
CLKIN2P
156
CLKOUT2N
157
CLKIN2N
158
3V3
159
12V
160
GND
170
GND
171
GND
172
C57
2.2uF
C57
2.2uF
C51
2.2uF
C51
2.2uF
C52
2.2uF
C52
2.2uF
C59
2.2uF
C59
2.2uF
GND
GNDGNDGND
BANK 1
J11A
ASP-122952-01
GND
GNDGNDGND
BANK 1
J11A
ASP-122952-01
XCVR_TXP7
1
XCVR_RXP7
2
XCVR_TXN7
3
XCVR_RXN7
4
XCVR_TXP6
5
XCVR_RXP6
6
XCVR_TXN6
7
XCVR_RXN6
8
XCVR_TXP5
9
XCVR_RXP5
10
XCVR_TXN5
11
XCVR_RXN5
12
XCVR_TXP4
13
XCVR_RXP4
14
XCVR_TXN4
15
XCVR_RXN4
16
XCVR_TXP3
17
XCVR_RXP3
18
XCVR_TXN3
19
XCVR_RXN3
20
XCVR_TXP2
21
XCVR_RXP2
22
XCVR_TXN2
23
XCVR_RXN2
24
XCVR_TXP1
25
XCVR_RXP1
26
XCVR_TXN1
27
XCVR_RXN1
28
XCVR_TXP0
29
XCVR_RXPO
30
XCVR_TXN0
31
XCVR_RXN0
32
SDA
33
SCL
34
JTAG_TCK
35
JTAG_TMS
36
JTAG_TDO
37
JTAG_TDI
38
CLKOUT0
39
CLKIN0
40
GND
161
GND
162
GND
163
GND
164
C60
2.2uF
C60
2.2uF
C45
100uF
C45
100uF
C61
100uF
C61
100uF
GND
A1
GND
A4
GND
A6
GND
B1
GND
B2
GND
B3
GND
B4
GND
B6
GND
C6
GND
D6
GND
E6
GND
F1
GND
F2
GND
F3
GND
F4
GND
F5
GND
F6
GND
G1
GND
G2
GND
G3
GND
G4
GND
G5
GND
G6
GND
H2
GND
H3
GND
H4
GND
H5
GND
H6
GND
K1
GND
K2
GND
K3
GND
K4
GND
K5
GND
K6
GND
L1
GND
L2
GND
L3
GND
L4
GND
L5
GND
L6
GND
M3
GND
M6
GND
N1
GND
N2
GND
N3
GND
N6
GND
P6
GND
Q6
GND
R1
GND
R2
GND
R5
GND
R6
DVDD18
A5
DVDD18
B5
AVDD18
C1
AVDD18
C2
AVDD18
C3
AVDD18
C4
DVDD18
C5
AVDD18
D1
AVDD18
D2
AVDD18
D3
DVDD18
D4
DVDD18
D5
AVDD18
E1
AVDD18
E2
DVDD18
E3
DVDD18
E4
DVDD18
E5
AVDD33
M4
DVDD33
M5
DVDD33
N5
DVDD33
P5
DVDD33
Q5
AVDD33
N4
AVDD33
P1
AVDD33
P2
AVDD33
P3
AVDD33
P4
AVDD33
Q1
AVDD33
Q2
AVDD33
Q3
AVDD33
Q4
GND
J2
GND
J3
GND
J4
GND
J5
GND
J6
C49
100uF
C49
100uF
GND
GNDGNDGND
BANK 2
J11B
ASP-122952-01
GND
GNDGNDGND
BANK 2
J11B
ASP-122952-01
D0
41
D1
42
D2
43
D3
44
3V3
45
12V
46
LVDS_TXP0
47
LVDS_RXP0
48
LVDS_TXN0
49
LVDS_RXN0
50
3V3
51
12V
52
LVDS_TXP1
53
LVDS_RXP1
54
LVDS_TXN1
55
LVDS_RXN1
56
3V3
57
12V
58
LVDS_TXP2
59
LVDS_RXP2
60
LVDS_TXN2
61
LVDS_RXN2
62
3V3
63
12V
64
LVDS_TXP3
65
LVDS_RXP3
66
LVDS_TXN3
67
LVDS_RXN3
68
3V3
69
12V
70
LVDS_TXP4
71
LVDS_RXP4
72
LVDS_TXN4
73
LVDS_RXN4
74
3V3
75
12V
76
LVDS_TXP5
77
LVDS_RXP5
78
LVDS_TXN5
79
LVDS_RXN5
80
3V3
81
12V
82
LVDS_TXP6
83
LVDS_RXP6
84
LVDS_TXN6
85
LVDS_RXN6
86
3V3
87
12V
88
LVDS_TXP7
89
LVDS_RXP7
90
LVDS_TXN7
91
LVDS_RXN7
92
3V3
93
12V
94
CLKOUT1P
95
CLKIN1P
96
CLKOUT1N
97
CLKIN1N
98
3V3
99
GND
165
GND
166
GND
167
GND
168
12V
100
C62
100uF
C62
100uF
C53
100uF
C53
100uF
C46
2.2uF
C46
2.2uF
GND
GNDGNDGND
BANK 3
J11C
ASP-122952-01
GND
GNDGNDGND
BANK 3
J11C
ASP-122952-01
LVDS_TXP8
101
GND
169
LVDS_RXP8
102
LVDS_TXN8
103
LVDS_RXN8
104
3V3
105
12V
106
LVDS_TXP9
107
LVDS_RXP9
108
LVDS_TXN9
109
LVDS_RXN9
110
3V3
111
12V
112
LVDS_TXP10
113
LVDS_RXP10
114
LVDS_TXN10
115
LVDS_RXN10
116
3V3
117
12V
118
LVDS_TXP11
119
LVDS_RXP11
120
LVDS_TXN11
121
LVDS_RXN11
122
3V3
123
12V
124
LVDS_TXP12
125
LVDS_RXP12
126
LVDS_TXN12
127
LVDS_RXN12
128
3V3
129
12V
130
LVDS_TXP13
131
LVDS_RXP13
132
LVDS_TXN13
133
LVDS_RXN13
134
3V3
135
12V
136
LVDS_TXP14
137
LVDS_RXP14
138
LVDS_TXN14
139
LVDS_RXN14
140
3V3
141
12V
142
LVDS_TXP15
143
LVDS_RXP15
144
LVDS_TXN15
145
LVDS_RXN15
146
3V3
147
12V
148
LVDS_TXP16
149
LVDS_RXP16
150
LVDS_TXN16
151
LVDS_RXN16
152
3V3
153
12V
154
CLKOUT2P
155
CLKIN2P
156
CLKOUT2N
157
CLKIN2N
158
3V3
159
12V
160
GND
170
GND
171
GND
172
C63
2.2uF
C63
2.2uF
GND
GNDGNDGND
BANK 1
J10A
ASP-122952-01
GND
GNDGNDGND
BANK 1
J10A
ASP-122952-01
XCVR_TXP7
1
XCVR_RXP7
2
XCVR_TXN7
3
XCVR_RXN7
4
XCVR_TXP6
5
XCVR_RXP6
6
XCVR_TXN6
7
XCVR_RXN6
8
XCVR_TXP5
9
XCVR_RXP5
10
XCVR_TXN5
11
XCVR_RXN5
12
XCVR_TXP4
13
XCVR_RXP4
14
XCVR_TXN4
15
XCVR_RXN4
16
XCVR_TXP3
17
XCVR_RXP3
18
XCVR_TXN3
19
XCVR_RXN3
20
XCVR_TXP2
21
XCVR_RXP2
22
XCVR_TXN2
23
XCVR_RXN2
24
XCVR_TXP1
25
XCVR_RXP1
26
XCVR_TXN1
27
XCVR_RXN1
28
XCVR_TXP0
29
XCVR_RXPO
30
XCVR_TXN0
31
XCVR_RXN0
32
SDA
33
SCL
34
JTAG_TCK
35
JTAG_TMS
36
JTAG_TDO
37
JTAG_TDI
38
CLKOUT0
39
CLKIN0
40
GND
161
GND
162
GND
163
GND
164
C54
100uF
C54
100uF
Figure 8. DC2085 Demo Circuit Schematic (Sheet 4)
SCHEMATIC DIAGRAM
14
dc2085afb
DEMO MANUAL DC2085
LINEAR TECHNOLOGY CORPORATION 2014
LT 0317 REV B • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation